<%@ page import="cn.gudian.cms.News.ArcType" %>
<ul>
  <g:each in="${arcTypeInstanceList}">
    <li>${it?.name}</li>
    <g:if test="${ArcType.findAllByParent(it)}">
      <g:each in="${ArcType.findAllByParent(it)}">
        <ul>
          <li>${it?.name}</li>
        </ul>
      </g:each>
    </g:if>
  </g:each>
</ul>